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There has been lively discussion about whether or not witches and wizards in the world of Harry Potter wear trousers under their robes (for example, in this tweet). I have not yet seen a definitive answer to this question online, though I have seen theories thrown around based on certain passages or statements by Rowling (like this one).
Is there any evidence in HP canon that wizards did/did not wear trousers under their robes?
Since this is basically the same question as the one on Sci-Fi I will summarize the answer from @Valorum.
Basically, some wear underwear, some don't even go that far. Valorum gives more quotes (I encourage you to take a look at his answer), but I feel that these are the best examples.
From The Order of the Phoenix, here's an example with underwear:
Snape was hanging upside-down in the air, his robes falling over his head to reveal skinny, pallid legs and a pair of greying underpants.
From The Goblet of Fire, an example without underwear:
Harry, Ron and Hermione joined it, right behind a pair of men who were having a heated argument. One of them was a very old wizard who was wearing a long flowery nightgown. The other was clearly a Ministry wizard; he was holding out a pair of pinstriped trousers and almost crying with exasperation. ‘Just put them on, Archie, there’s a good chap, you can’t walk around like that, the Muggle on the gate’s already getting suspicious –’ ‘I bought this in a Muggle shop,’ said the old wizard stubbornly. ‘Muggles wear them.’ ‘Muggle women wear them, Archie, not the men, they wear these,’ said the Ministry wizard, and he brandished the pinstriped trousers. ‘I’m not putting them on,’ said old Archie in indignation. ‘I like a healthy breeze round my privates, thanks.’
All credit to Valorum for this, he did the work.
